Reports coming out of the camp earlier today claimed that the 22-year-old had been taken to hospital to have the problem assessed.
However, De Bruyne has dismissed those rumours and has instead insisted that he is "fully fit" to face Croatia on Friday night.
"Just to say. I'm fully fit for the game against croatia. No injury at all," he wrote on Twitter.
De Bruyne has made 14 appearances for the Red Devils at senior international level.